In a glass tube of dia 'd', the capillary rise or fall (h) of a liquid, where surface cohesion is σ, angle of contact is 'θ' is given by the equation:

1
h = w cos θ/d
2
h = 4 cos θ/d
3
h = 4 σ cos θ/wd
4
h = flv/d
5
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